Telegraph printer



Sept. 7, 1943.. c. J. FITCH ET AL 2,328,636

TELEGRAPH PRINTER Original Filed Aug. 24, 1940 6 Sheets-Sheet l v ATTORNEY Sept. 7, 1943. c. J. FITCH ET Al. 2,328,536

TELEGRAPH PRINTER Original Filed Aug. 24, 1940 6 Sheets-Sheet 2 Sept. 7, 1943. C. J. FITCH ETAL 2,328,636

' TELEGRAPH PRINTER l Original Filed Aug. 24, 1940 e sheets-sheet s I5 INVENToRs 'ATfoRNEY Sept. 7,1943. c. J, FITCH ET AL 2,328,536

' v TELEGRAPH PRINTER Original Filed Aug. 24. 1940 6 Sheets-Sheet 4 INVENTORS n ATTORNEY.

Spt, 7, i943 y c. J. FITCH ET AL vTELEGRAPH PRINTER original Filed Aug. 24, 1940 6 Sheets-Sheet 5 umN ATTORNEY.

Sept. "7, w43s c. J. FITCH x-:T A1.

TELEGRAPH PRINTER Original Filed Aug. 24, 1940 6 Sheets-Sheet 6 FIG@ .R Mm. mi n N OPM R ,V mmm A R fw m ,w 8 u S w 7 E d w Patentedrsept. 7, 1943 TELEGBAIH PRINTER Clyde J. Fitch, Endweil, and ,Kurt Rudolf Schneider, Endicott, N. Y., assignol's to International Business Machines Corporation, New York. N. Y., a corporation of New York original application August 24, 1940, serial No. 354,035. nlvluea and this application July l,

1941, serial Nlp-100,600

2 Claims.

The present invention relates to printing telegraphy and more particularly to receiving devices for printing telegraphy wherein a. message is recorded by impressing characters upon a' tape.

'I'he invention embodies a typewheel. in combination with novel printing, tape feeding, ribbon'. feeding and ribbon reversing; and shift mechanism and the present application is a division of applicants copending application Serial No. 354,035 led August 24, 1940.

.An object of the present invention is to provide in combination with a telegraph receiver of the present type including printing mechanism, novel printing hammer operating mechanism.

Other objects of the invention will be pointed out in the following description and claims and illustrated in the accompanying drawings, which disclose, by Way of example, the principle of the invention and the best mode, which has been contemplated, of applying that principle.

In the drawings:

Fig. 1 is a front elevation, partly ill section of an embodiment of the present invention.

Fig. 1a is a detail view illustrating the opera- 4tion of elements of the shift control mechanism.

Fig. 2 is a plan view of the device of Fig. 1, wit the ribbon feeding mechanism omitted.

Fig. 3 is a partial plan view ofthe device of Fig. 2 illustrating, on an enlarged scale, the two groups of permutation rings comprising the se-- lector mechanism.

Fig. 4 is a sectional view, on an enlarged scale taken on the line 4-4 of Fig. 1.

Fig. 5 isa sectional view, on an enlarged scale, taken on the line 5-5 of Fig. 4.

Fig. 6 is an exploded view illustrating the construction of one of the selector clutch mechanisms.

Fig. 7 is a sectional view illustrating details of construction of the clutch mechanism of Fig. 6.

Fig. 8 is an exploded view illustrating the construction of the elements comprising the shift mechanism.

Fig. 9 is a view similar to Fig. 8, at a different perspective, illustrating the opposite 'sides of the elements comprising the shift mechanism.

Fig. 10 is a diagrammatic view illustrating the manner of rotation of the typewheel during shift.

Fig. 11 is a View similar to Fig. 10 illustrating the typewheel in a shifted position.

Fig. 12 is a -development of the printing surface of the typewheel. y

Fig. 13 is a` detail View illustrating the construction of the permutation ring interlock and release mechanism.

(Cl. 19'1-49) l Fig. 141s a side elevation illustrating the construction of the ribbon feed and ribbon reversal mechanism.

Fig. 15 is a view similar to Fig. 14, with parts omitted, illustrating the gear drive of the ribbon feed mechanism.

Fig. 16 is a view similar to Fig. 15 illustrating the position of a star wheel just prior to ribbo reversal. Y

Fig. 17 is a view similar to Fig. 16 illustrating the position of the star wheel just after reversal of the ribbon feed mechanism.

Fig. 18 is a. plan view on an enlarged scale illustrating the mounting of the ribbon feed and reversal mechanism. v

Referring to the drawings, and more particularly to Figs. 1, 2 and ,4, the printer mechanism comprises afsupporting frame 20 having a vertically extending lug 20a to which is attached a plate 2| by a slotted screw 2 la. Fastened to plate 2| by suitable means (not shown) is a casing including a three-section gear box 22 housing the gears 23', 24 and 25. Gears 23 and 24 are suspended above and in mesh with gear 25 (Fig. 2) by means of shafts 23a and 24a to which the gears 23 and 24 are, respectively, attached. Shaft 24a is mounted in ball bearings 2lb, 2lb carried by the walls of the gearbox (Fig. 4) the shaft 24a carrying at one end thereof the gear 24o. Shaft 23a is similarly mounted in ball bearings carried to the main drive shaft 25a which 'is mounted' in eball bearings 25h, 25h supported in its section of the housing, shaft 25a carrying at one end `thereof a gear. 25e (Fig. 4). Fastened to shaft 25a at the other end thereof, is a pulley 26 driven by a belt 21 which in turn is driven by a pulley 28 fastened, to the shaft 29 Fig. 2) of motor 30. Gears 23 and 24 are of equal diameter which is so chosen with respect to the diameter of gear 25 as to rotate gears 23 and 24 at 1200 R. P. M. upon rotation of gear 25 at the rate of 900 R. P. M. By means of this dierence'in speed of rotation, the typewheel may be completely set before other functions are performed, as will be pointed out in detail later.

In axial alignment with the shaft 23a is a shaft 23A (Fig. 2) carrying-a generally cylindrical element 3l having a helical shaped cam groove Sla vformed in the outer periphery thereof.

shaft 24A (Figs. 2 and 4) carrying the composite typewheel 32,V mounted on shaft 24A for rotation therewith and axial movement with respect thereto,- as will be described presently.

In axial alignment Iwith shaft 25a is a shaft 25A carrying the shift operating cam 33 (Figs. 1 and 4), print hammer operating cam 34 (Fig. l) and the ribbonA feed and reversal mechanism operating cam 35"(Figs. 1 and 4).

Shaft 24A is supported at one end in the ball bearing 36 (Fig. 4). The other end of shaft 24A terminates in a hallowed out .portion 31 into which is inserted the shaft portion 38h (Figs. 4 and 6) of a clutchmechanism 39. Shaft por-l tion 38b is supported by a roller bearing 40 (Fig. 4) enclosed in housing 40a (Fis. 2) and is fastened vto shaft 24A by-a pin 4I (Fig. 4). Clutch 39 is provided with a dog lift lever 42 (Fig. 6) controlled by stop members acting in conjunction with the permutation rings of the selector mechanism, in a manner to be described presently. By control of the dog lift lever 42, the clutch 39 may be stopped in various chosen rotative positions and a tooth 43t of the clutch mechanism will thereupon be disconnected from the driving gear 24e (similar to 23o, Fig. 6), all as 'described presently. Upon release of the dog lift lever 42, as will be presently described, the tooth 43t moves into engagement with the driving gear 24o (Fig. 5) whereby the clutch 38 will be rotated until lever 42 is again engaged by a permutation ring controlled stop member thereby positioning' the clutch 39 and shaft 24A in accordance with shaft 24A.

Clutch 33 pertaining to shaft amis an eight?.

position clutch, generally of the type as fully described in the Patent No. 2,206,646, granted to Kurt R. Schneider, July 2, 1940 and comprising a cylindrical member 38 provided in this particular clutch with a series of eight notches such as 44 (Fig. 6) formed in a flange member 38a p integral with member 38. The shaft portion 38h previously referred to, `which is integral with Vmember 38, extends into the hollowed portion 31 (Fig. 4) of shaft 24A and is attached thereto, as described above. A pawl member 45 is pivoted at 45a and is urged by a spring element 45h (Fig. 7) into engagement with fiange member 38a to cooperate with a notch 44 and thus prevent back rotation of the clutch when stopped in any one of its eight rotative positions.

As is seen from Figs. 6 and '1, the face of member 38 adjacent to its gear 24C (similar to 23o,

shown) is provided with a channel 46 in which is slidably mounteddog member 43 having the tooth '43t mentioned above. A support member 38e, integral with member 38, extends part way in to channel 46 and is provided with a reduced portion 38d axially supporting a cylindrical spring member 41 located in a bored portion 43a formed in dog member 43, the spring member 41 concrosswise of dogV member 43, this center portion being rounded to provide rolling engagement between the sides of recess 431' and the portion 42h. The opposite end of the lever 42 is cut diagonally to form a tooth portion 42t projecting beyond the circumference of member-38. A slot 38sl is formed in the face of member 38, generally at right anglesv to ychannel 46 `to permit oscillation ofl lever 42, with respect to 38, about the ball and socket members 42a and 38r,..respectively,

when 42t is engagedby a stop as described later. v

When tooth 43t is released upon a change in setting of the members of the permutation unit,V

as described later, the dog member 43 will engage its 'tooth 43t with gear 24e' and lever 42 and member 38 will be rotated by means of gear 24o in the direction as indicated by the .dash arrows in Fig. 5. Upon engagement of end 42t and a stop member controlled by the elements of the.

permutation unit, as described presently, the lever will be relatively moved, with respect to 36, about its ball and socket connection to the position as shown in Fig. 5, thereby disconnecting tooth 43t and gear 24e.

Back rotation of element 38 is prevented by engagement of pawl45'with one of the eight notches 44 formed in the angel 38a of this par- .ticular clutch, thereby stopping the clutch at one of eight predetermined positions when the clutch is controlled in the novel manner as presently described.

Shaft 23A is supported at one end by a ball bearing similar to bearing 36 of 'shaft 24A and contained in .housing 48 (Fig. 2). The other end of shaft 23A terminates in a hollowed out portion, similar to portion 31 of shaft 24A, into which is inserted a shaft portion 38h of a clutch 38, similar to that provided for shaft 24A with the exception that the flange member 38a of this'.

clutch is.provided (Figs. 5 and 7) with four notches 44 only, to prevent back rotation of this clutch member from any one of the four stop positions.

Shaft 275A'is similarly supported at one end by a ball bearing 36 (Fig. 4) and is provided With'a hollowed out portion similar to portion 31 of shaft 24A, into whichprojects a shaftI portion 38h of a clutch 39 associated therewith, and similar to clutch 39 of shaft 24A, with the exception that only one notch 44 is providedin its flange member 38a to prevent back rotation at one stop 'position only of shaft 25A, as described presently.

Tgpewheel positioning Novel means are now provided for positoning a typewheel character carrying element 50 of the composite typewheel 32; The positioning of typewheel element 50 includes three separate operations, namely, rotatively positioning the type- -wheel element, axially positioning the typewheel element andI zone positioning of the typewheel element, which zone positioning comprises the shift function. These three operations will now be described in detail.

Rotatz've positioning of the typewheel As illustrated in Fig. 2, a plurality of five magnets is provided. each responsive to one element is connected inthe return line of the otherv five magnets and is operated upon energization of any one of these magnets, to produce tape feed. ribbon feed, printing and zone positioning, all as described presently.A It is deemed obvious that magnet 56 may be independently connected for operation by a separate code signal component, such as the stop componentfif sequentialcode signal components are utilized.

Referring to Figs. 3, 4 and 5, means entering into a novel combination with the respective clutches 39 are disclosed therein. That particular clutch 39 which controls the rotative positioning of shaft 24A and therefore 'the rotative positioning of the typewheel 50 Yis shown as Surrounded by a plurality of three permutation selector rings 51, 58 and 59, respectively, contained within the casing 60, mounted on the side of gear box 22. These rings are maintained in position surrounding the clutch 39, by means of casing 60 and eight clutch stops 6I, as shown. Each of the stops 6| is formed as a yoke having a toothed portion Sla at one end thereof bearing against the outer periphery of the three rings and another portion SIb comprising a laterally extending stop cooperating with the toothed end 42t of lever 42 when the particular stop is se` Each of these stops is mounted for radial movement and is constantly urged towards the center of the rings and against the outer peripheries of the rings, by means of individual springs 63.

each of the respective rings. will be aligned for each of the eight permutation positions of the three rings and such alignment occurs directly beneath one of the resiliently ,operatedv stops 6i. The toothed portion Bla ofthe particular stop selectedywill enter the three respective aligned notches 51u, 5811 and 59u in the three rings, under the inuence of its spring 63'whi1e al1 of the remaining stops are held in 'theirfmost remotel radial position by the outer peripheries of the three rings. A A diierent stop is, therefore, permitted to move radially inward for each of the eight permutation positions of the three rings.

Assuming that this clutch 39 was .previously stopped in one position by engagement between a stop element 6| and its lever 42; upon reception f of a different signal permutation which energizes Each of the three permutation rings is held against bodily lateral movement between the solid end of casing 60 and the mid-portion of the stops 6I, the rings riding on support; 62 (Fig. 4). Each of the rings 51, 58 and 59 may be rotated by means of an arm 64 (Fig. 5) extending outwardly from casing 60 and connected to an individual tension spring 65 which constantly holds the corresponding ring in one of two rotary positions. Each of the arms 64 is connected by a link 66 to one end of a lever 61 which is pivoted at its other end 68 to a point 69 and connected near its mid-point to a movable core 10 controlled by the corresponding magnet; the rings 51, 58 and 59 being thus connectedto the magnets 53, 52 and 5i, respectively. Upon energization of any one of the magnets 5I, 52 or 53, the corresponding ring will be rotated against the pull of.

its associated ring 65 and will assume its second rotary position. l

As shown (Fig. 4), there are three permutation rings encircling that clutch 39 which controls the shaft 24A and since .each ring may be operated to any one of two positions' a vtotal ofeight permutation positions may be obtained. Each of the three rings is provided with a series of-eight notches, each one respectively of the series of the respective notches being designated as 51u, 5811. and 591i, which' notches are formed in theouter periphery of the corresponding ring, the notches on the respective rings being so positioned relatively to each other that a plurality of three notches, and three only, one only on at least one of the `magnets 5l, 52 or 53,'one of the rings 51, 58 or 59 will be rotated to its second rotative position and the previously' rotated rings will be reset tol the first rotative position by means of their respective springs 65. Upon rotation of any one ring to its second position, a

diil'erent set of notches on the respective rings Will be aligned and another stop member will be newly set, and the previously set stop member 8| will 'be cammed out of its associated group of notches so that the lever 42 will be released from the previousl'y set stop member thereby permitting the dog 43 to move its tooth 43t into engagement with gear 24e. thereupon be rotated until tooth 42t of lever 42 engages the laterally extending end-6|b of the vunder the urge of spring 45h to thereby prevent back rotation of clutch 39. By this rotation of clutch 39, shaft 24A and typewheel member 50 Will'be rotatively positioned in accordance with the particular relative setting of the permutation 4' rings 51, 58 and 59 or, in other words, in accordance with the particular permutation of three of the code signal elements received. In this manner, any one of eight circumferential positions of the typewheel' can be selected. As is seen from the development of the typewheel 50 (Fig. 12), there are sixteen rotative or circumferential positions. Since only eight equallyspaced circumferential positions are chosen by the three per mutation ring elements 51, 58 and 59, additional means must be provided for selecting the intermediate zone positions between each of the chosen eight rotative positions. As is seen from Fig. 12, the circumferential positions in each ring of characters are divided alternately into figures and letters characters, so that selection of the respective zone positions corresponds to a shift of the typewheel. The manner and mechanism for zone positioning or shifting of the typewheel will be described presently.

Arial positioning of the typewheel The two magnets .54 and 55 (Fig. 2) and the associated permutation ring members 1I and 12 (Figs. 3 and 5) which rings are similar to rings 51, 58 and 59, described above, control the axial positioning of the typewheel. Magnets 54 and 55 control, respectively, the rotative positions of The clutch 39 will' thepermutation rin-gs 1| and 12 in the same manner as magnets 53, Stand/5| control, respectively, the rotative positioning of rings 51,

' 58 and 59, all as described above.- Since each of the permutation rings 1| and 12 may be positioned in each of two positions, there is a total of four permutation positions possible for `these two rings and one of the four stop members 6| (Fig.

' 5), distributed as illustrated in Fig. 5, will be aligned with a set of two notches 1|n, 121i in the respective rings 1I and '12, in each ofthe four permutation positions of rings 1| and 12, so that the particular clutch 39 controlled by rings v1| and 12 and controlling the rotation of shaft 23A willV be stopped in any one of four different rotative positions, in the same manner as described in detail with respect to shaft .24A which can be stopped in a'ny one of its eight rotative positions. A plurality of four notches 44 (Fig. 7) cooperates with a pawl 45 to prevent back rotation in any one of these four positions. l, I

It isto be particularly noted, that those ones of the magnets 5| to 55, inclusive,A which are energized in accordance with a' particular received code permutation of signal elements, do not remain energized until reception of the next character signal but these selected magnets are only momentarily energized. Consequently, the permutation selector rings must'be locked in position after the momentary energization of the selected magnets, in order to prevent the springs 65 from returning the rings to their initial positions. The locking means must also bel releasable in order to set the rings in accordance with a sequentially received code signal. Novel means are therefore provided for interlocking the permutation rings pertaining tothe different shafts and for releasing the selectivelyset rings when the succeeding code ysignals differ.

Referring to Figs. 3, 5 and 13, an interlockingpawl 13 is pivoted at'13p and is urged in a clockwise direction by lever 14 pivoted at 14p and biased into -engagementwith pawl 13 by means of -a spring 13s. Pawl 13 is generally S-shaped and has a toothf 13a at one en d which bears on the peripheries of rings 51, 58 and 59'and -has a tooth 13b at the other e'nd which bears on the peripheries of rings 1| and 12. Each of the five permutation rings has two special notches 13M, 13112, formed in its outer periphery, in addition to the regular notches previously described, one of these special notches, 1371.1, for example, cooperating with a pawl tooth inthe initial or first position of the permutation ring and the other, 13112, cooperating with a pawl tooth in the new or second position ofthe ring. The arrows in Fig. 13 indicate the direction in which the respective members of the two groups of rings are rotated upon energization of the corresponding magnet; for example, ring 51is shown in its initial or rst position and will be pulled clockwise to its second position, while ring 58 has already been pulled to its second position. Notches 13n| and 13n2 are separated by a tooth element 13t which does not extend to the outer circumference of the ring so that when any one of the five rings is rotated from its first to its second position, the interlocking pawl 13 will be cammed counterclockwise to clear the teeth 13t to unlock the rings and to thereby permit those rings whose magnets'are not energized, to return to the rst position under the control of the respective springs 55 and those rings pertaining to the magnets which are energized are permitted to remain in or to be moved to the second position whereupon thepawl teeth 13a and 13b will drop into position to lock the rings in their newly assumed positions.

With a 5unit code, the following situation may arise. -A character signal received, may require the positioningfrof rings 58 and 1| for example ln their second positions and rings 51, 59 and 12 in their first positions while a sequentially received character signal may call for ring 1| mits second position and all of the other rings in their 'lrst positions. Under the assumed conditions, none of the rings is 'to be moved from its first to its second position by the sequentially received signal. In order to insure release of the rings under the conditions assumed, the rings are so mounted and operated as to overrun their finally assumed second position, when operated by the respective magnets. Thus, in the example chosen, although ring 1| is already in its second position, it will, upon reception of the sequential signal, be oscillated past this 'flnally assumed second position a slight amount and tooth 13b of the pawl will be'cammed counterclockwise (Fig. 13), and since the teeth 13t do not extend to the outer periphery tooth 13a will no longer hold ring 58v which returns to its initial position under the control of its spring 65 so that all of the rings except ring 1| will assume their original positions. 1

It is seen therefore, that upon oscillation of any one of the rings 51, 58 or 59, that the previously selected stop 6| will be cammed out of its cooperating notches to release lever 42 of the of the shaft 23A, under control of its four position clutch, rotates the cam member 3| to any one of four diierent rotative positions. Upon such rotation, cam slot 3|a will be rotated so that the sides ofthe slot can be utilized to produce movement axially of shaft 23A.

A forked lever. 15 (Fig. 2) pivoted at 15p, has a ball-shaped member 15a at one end of the single arm thereof which ball rides in cam groove 3|a to thereby rotate the lever 15 in a horizontal plane about pivot I 15p upon rotation of shaft 23A. The forked ends 15b and 15o (Fig. 4) of lever 15 are provided with rollers 15r which engage the sides of a circumferentially extending groove 16 (Fig. 2) formed in a cylindrical member 11 comprising an element of the composite typewheel 32. Upon rotation of shaft 23A to assume any one of its four rotative lpositions under the control of the permutation rings 1| and 12, the cam slot Sla. will move the ball-shaped member 15a to four different positions axially of shaft 23A, to thereby oscillate lever 15 about pivot 15p to move the arms 15b and 15e laterally whereby the member 11 and typewheel element 50 are moved axially of shaft 24A to four different positions. The

construction of the composite typewheel proper above, the typewheel element proper 50, previously described, typewheel zone selection operating member 18 and sleeve mem-ber 19, al1 mounted on shaft 24A. Sleeve member 18 comprises a hollowed cylindrical portion 18a provided with a flange 19h at one end thereof, having a pair of diametrically aligned slots 19o extending radially inward from the outer periphery of the iiange. A pair of diametrically opposed, rectangular apertures 18d (Fig. 8) are cut through the wall of the cylindrical member 18a adjacent the opposite end thereof, from the outer periphery to the inner bore 18e.

Zone selection operating member 18 is provided with an elongated, generally elliptical opening 18a in the center thereof whereby member, 18 can be mounted on the cylindrical portion 18a of member 18 for rotation therewith but at the same time be free to move radially thereof under the control of zone selecting mechanism to be described later. One face oi' member 18 (Fig. 9)

is provided with a pair of diametrically opposed projecting lugs 18h, 18h which ilt into and slide against the sides of slots 19o when member 18 is mounted in position on member 18, as illustrated inFigs. 2 and 4. Theopposite face of member 18 is provided with a pair of diametrlcally opposed cylindrical lugs 18e, 18e (Fig. 8) which project respectively into each of the eccentric slots 88a (Fig. 9) formed in the face of the typewheel element 50 -wheroby the typewheel is rotated upon operation of member 18, as described presently. A pair of holes 18d,'18d are formed in 'one side member of member 118 which holes coact with a ball member 50h (Fig. 9) in an opening 80e formed in typewheel element 5|), said ball member being urged toward the holes 18d by means of a helical spring member 58s, to -maintain the member 18 in either one of the positions to which it is operated, 'it being noted that the holes 18d are of smaller diameter than ball 50h, so that only a portion of the ball enters one'of the openings 18d, and upon movement of member 18, radially of member 18a. as described presently, the ball 50h is disengaged-from one hole 18d and subsequently engaged with the other. The typewheel 5||, as previously described, has a plurality of letters and figures formed in the outer periphery thereof, the sixteen axially extending rows comprising alternately gures and letters, as illustrated in development in Fig. 12, so that, upon rotation of the typewheel element to any one of the eight rotary positions produced by rotation of shaft 24A, as previously described, either a row of ilgures or a row of letters is selected and shift is produced by operation of member 18 to rotate the typewheel one sixteenth of a revolution, as described presently. A pair of rounded notches 5011., 5811. are provided on the inner periphery of the typewheel element 50 which coact with a spring urged ball element 11e (Figs. 4 and 8) to stop the typewheel element in eitherone of two alter-nate positions. 'I'he typewheel 50 is provided with an axial bore 50a so that this element can be mounted on the cylindrical member 19a, as disclosed in Fig'. 4. A Member 11 is provided with a pair of diametrically opposed slots 11a extending radially from the outer periphery thereof to the inner bore 11b, into which is inserted the cylindrical portion 19a of member 19, as show-n in Fig. 4, until cylindrical portion 19a abuts end 11d providedwith an opening 11e for shaft 24A. The ball shaped member 11c, previously mentioned, is located in an opening 11d (Fig. 4) and is spring urged by a helical spring 11s into engagement with one or the other 0f the openings '5811. (Fig. 8) of the of the typewheel produced by the shift function. A rectangular pin 8|) (Fig. 4), is inserted into one of the slots 11a of member 11 and passes through the rectangular apertures 18d of memberl 19 and through a rectangular slot 24S out axially of shaft 24A. (Fig. 4), for movement axially therein and into the other slot 11a of member 11, to connect the members 11 and 19 to shaft 24A for rotation therewith and to permit movement axially thereof. Typewheel 50 is locked to member 11 by means of spring 11s (Fig. 4) and ball 11e, for rotation therewith upon rotation lthereof and moves axially of shaft 24A upon axial movement of members 11 and 19. Member 18 is held between ange 18h on one side and typewheel 50 on the other, but in one axial position of the typewheel assembly, the member 18 is moved radially,

by means to be described presently, to thereby rotate 'the typewheel one sixteenth of a revolution to produce shift of the typewheel element.

Zone positioning or shift v Novel means are now provided for producing zone positioning or shift of the typewheel. As described above, in one axial position of the typewheel element, zone positioning, operating member 18 is so located as to be operated radially, to thereby shift the typewheel element one s'iX- teenth of a revolution, which operation comprises the shift of the typewheel from letters to figures or vice versa, since, as is seen in Fig. 12, the axially extending rows of characters are alternately letters and gures.

Shaft 25A is provided with the operating cam member 33 adjacent one end thereof (Fig. 4) which rotates in the'same plane as lever 8| (Fig.

. l) having an elongated aperture 8|a formed in Lever 8| is positioned so as to abut the button 84 (Fig. 4) spring pressed by helical spring 85 against one face of the lever 8|. By means of the pivot suspension of lever 8| composed of the pin 82 extending into the elongated slot 8m, and by means of the resilient support provided by spring 8|s andthe spring 4pressed button 84, the lever 8| is protected against deformation. If for any reason, the timing between the cam 33 and the typewheel is not correct and lever,8| is raised before the typewheel assumes its `extreme right hand position (Fig. 4), the resilient support of the lever 8| will prevent breakage or injury to the lever or typewheel.

Upon reception of thecode signal indicative of shift, the typewheel will be moved to its extreme right hand position, as viewed in Fig. 4, with' the member 18 extended oi center from shaft 24A, downwardly, an amount dependent upon the eccentricity of opening 18a (Fig. 8) and with member 18 in alignment with lever 8|. As shaft 25A rotates, cam 33 rides across the bottom of lever 8| and raises thefree end 8U (Fig. 1a.) of this lever into engagement with zone selection, operating member 18 and due to the coaction of lugs 18b and slots 19e moves the member 18 radially of the shaft 24A. Upon such radial movement, the cylindrical lugs 18c (Fig. 8) riding in the eccentric slots 50a (Fig. 9) will rotate the typewheel one sixteenth of a revolution to thereby shift from letters to figures or vice versa.

As is seen from Figs. 10 and 11, upward motypewheel 50, depending upon the zone position 15 tion of member 18, as viewed in Fig. 4, will move lugs 18cm slots 60a to rotate the typewheel 50. .With member 18 in one downwardly extending posaient the lugs 18e win 'oe moved from the positionas shown in Fig. 10 tothe position as shown in Fig. 11 and the typewheel will be rotated one sixteenth of a revolution in one direction. Upon 180 rotation of4 shaft 24A, the opposite operating end of member 18 (Fig. la) will shift signal, the typewheel is rotated from lettersv to figures in the opposite direction.

' Tape feed and printing A roll of tape 86 (Fig. 4) is mounted within the tape roll support 81 attached by a bolt 81a to the arm 88 (Figs. l and 2) carried by the frame 20. Tape 86 unwinds from its roll and passes under and over a plurality of guide rollers 89 and iinally underneath the typewheel 50 and between the feed rollers so'that upon rotation of the feed rollers, as described presently, the tape 86 is fed past the typewheel element 50, and the characters -of-the typewheel, which are selected by the permutation selector mecha-v nism, will be typed upon tape 86 by means of the printing mechanism to be presently described.

The feed rollers each comprise a pair of separate rollers 90a and 90b and 9|a and 9|b, respectively. Rollers 90a and 90b are rotatively mounted on stationary studs 92. Rollers 90a and 90b are each provided with a gear 93 '(Figs. 1 and 2) integral therewith and meshing with gears 94, respectively, fastened to the 'shaft 95. Shaft 95 is rotatably carried by a lever 96 (Fig. 1) pivoted at 91 to the frame 20. The lever 98 is biased upwardly (Fig. l) by a spring 98 so that rollers 9|a and 9|b are. Iconstantly urged towards the rollers 90u and 90b with the tape 86 between the respective pairs of rollers, as is seen in Fig. l. Mounted on the shaft 95 for rotation thereof is the ratchet wheel 99 located between the rollers 9|a`and 9|b (Figs. 1 and 2). A pawl pivotally mounted at |0| on lever |02 engages a tooth of ratchet 99, and upon depression of lever |92, as described presently, pawl |00, which is constantly urged into engagement with ratchet wheel Y99 by means of a spring |00s, will slide over a tooth on the wheel 99 and engage the next lower tooth of the ratchet wheel so that upon release of the lever |02, pawl |00 will rotate the ratchet ywheel 99 an amount proportional to the advancement of one tooth, to in turn rotate the shaft 95 and gears 94 meshing with gears 93 integral with the rollers 90a and 90b.\ Since rollers 9|a and 9|b are integral with the shaft 95, the rollers 90a, 90b, and the rollers 9|a and 9|b are rotated simultaneously to advance the tape'BB past the typewheel 50.

Novel printing means are provided, as will now be described, and comprise lever |02, as shown in Fig. l, which is mounted at one end 0n pivot |03 passing through frame 20. The other end of lever |02 is constantly urged upwardly by a spring element |04.

Lever |02 passes through a slotted opening |05 formed in the print hammer housing |06, fastened to frame 20 in any desired manner. A. Vertically reciprocable hammer member |01 is mounted within the print hammer housing |00 (Fig. 1) and is constantly urged upwardly by means of ra spring |08 pressing against the piston portion |01a of the hammer |01. A slot |01b is formed in .the hammer member |01 in alignment with slot |05 and the lever |02 passes thrbugh the slot |81b so that upon downward oscillation of lever |02, it will depress the hammer |01 against thel force of spring |08.

A trigger latch |09, pivotally mounted at |09a,

I' is Iconstantly urged counterclockwise by spring |09s. IAs the printing hammer |01 is depressed by lever |02, latch y|09 will engage a notch |011: in the printing hammer |01 to hold the hammer in cocked position until the trigger latch |09 is subsequently released.

Mounted on shaft 25A are the several cams 3l,

34 and 35 previously mentioned, cooperating-re-- spectively with the levers 8|, |02 and ||0, cam 34 also cooperating with a cam follower |09b of the trigger latch |09, as described presently. The lever ||0 is pivoted at for oscillation in a vertical plane and is pivotally connected vto the link ||2 for feeding the type ribbon |13, as will be described presently.

As previously described, the flange member 38a, of that clutchV 39 which controls the shaft 25A, is provided with a single notch 44 (Fig. 5) to prevent back rotation of the clutch upon stoppage of this clutchin its single position. The tooth shaped end42t of the dog lift lever 42 of this particular clutch 39 (Fig. 5) is engaged and held in the position as shown in Fig. 5 to maintain the clutch 39 disengaged by means of a stop lever ||4 pivotedV at 5 and connected to link ||6 pivotally connected at ||1 to onel arm ||8 o1' a bell-crank 9 pivotally mounted at |20. Armature 56a of the magnet 56 which is connected in the return line of the magnets 5| to 55, inclusive, as previously described, forms.

the other arm of the bell-crank ||9 (Fig. 5) so that upon energization of any magnet, the magnet 56 is energized to attract its armature 66a 'whereupon the bell-crank ||9 is oscillated clockwise about pivot |20 to raise the link-,i |6 and lower the free end ||4a of lever ||4 to thereby release the dog lift lever 42, so that tooth 43t engages the gear 25c`and clutch 39 is rotated one complete revolution, prior to which time, the magnet 56 is deenergized and the spring ills, acting through the lever ||4, link ||8 and bellcrank ||9, restores the armature 56a to the position as shown in Fig. 5.

It is seen, therefore, that shaft 25A is rotated once for each code permutation of signal elements received. Upon rotation of shaft 25A, cam 34 (Fig. 1) will depress the lever |02 to lower the plunger |01 until the trigger latch |09, continuously urged counterclockwise by spring |09s, engages the notch |0111, to hold the plunger in the cocked position, as described above. As shaft 25A continues to rotate, the cam 34 will engage the cam follower |09b to release the trigger latch |09 and the spring |08 will quickly force the plunger |01 upwardly to force the tape 86 and ribbon ||3 into operative relation with the typewheel character selected by the permutationselector mechanism to thereby print the selected character on the tape 86.

Ribbon feed and reversal Novel ribbon feed'and ribbon reversal mecha nism are provided, as illustrated generally in Figs. 1 'and 4 and specifically in Figs. 14 to 18,

. A 2,828,836 inclusivai As shown in Figs. 1 and 4, cam 35 mountedon shaft 25A is rotated therewith, one ,complete revolution for each code permutation of signal elements received. Cam 35 cooperates with lever (Fig. 1) to oscillate it about its pivot Link ||2 is pivotally connected to lever 0, so that as cam 35 rotates, it engages lever ||0 once for each revolution of shaft 25A and raisesl lever H0 and the attached link 2.

Referring to Figs. 1 and 4 and to Figs. 14 to 18, inclusive, link ||2 is pivotally connected at one end by pivot |2| to lever ||0 and at its other end by pivot |22 to one arm |23 of a bell-crank element |24 mounted for rotation about shaft |25 journaled in plates |28 and |21, mounted on the frame 20. A pawl |20 pivoted at |23 to the bell-crank element |24 is biased against a ratchet wheel |30 by a spring |28s (Fig. 14) attached to the arm |24a of bell-crank |24 at one end, and to pawl |28 at the other. As llink ||2 is raised by the action of cam 35 on lever ||0, the pawl |28 will be moved back one tooth on the ratchet wheel |30, attached to shaft |25 for rotation'` As the cam 35 releases the lever ||0,

` ratchet wheel |30 an amount proportional to one tooth movement. A locking pawl |3| pivoted at |32 on plate |26 (Figs. 4 and 14) is held in engagement with ratchet `wheel |30 by a spring |3|s, so that back rotation of ratchet wheel |30 is prevented. As theratchet wheel |30 advances counterclockwise, it rotates the shaft |25 counterclockwise to thereby rotate gear |33 (Fig. 15) in the same direction. Gear |33 meshes with i'lve small pinion gears |34 each loosely mounted on a stud |35, which studs join together the star wheels |360. and |,35b looselymounted on shaft |25. AAs gear |33 is rotated counterclockwise, step by step, the pinions |34 will be rotated clockwise about their respective studs. A lever |3'| pivoted at |38 on plate |26carries a roller |33 intermediate its ends, engaging the outer periphery of star wheel |36a (Fig. 18). 'I'he other end of lever |31 is constantlyY urged clockwise by a spring |3'Is connected to lever 31 at one end and'to plate` |26 at the' other so that the roller |39 is constantly held against the outer periphery of the star wheel |36a.

As illustrated in Figs. -14 and 15, one of the gears |34 is in meshing engagement with a gear |40 mounted for rotation on shaft |4| journaled in plates |26 and |21. Shaft |4| extends through the plate |26 (Fig. 18) and carries at its end a spool |42 on which may be wound the ribbon H3. A friction washer |42w is provided between the spool |42 and plate |26 to prevent shaft |4| from turning too freely. A similar spool .|43 is mounted on a shaft1|44 journaled in plates |20 and |21 and .attached to this shaft is a gear |45 equal in diameter to the gear |40. A friction washer |43w similar to washer |42w is also provided:

As gear |40 and spool |42 are rotated counterclockwise as viewed in Fig. 14, or clockwise as viewed in Fig. 1 the spooll |42 Winds up the ribbon ||3 and unwinds itfrom spool |43. When the ribbon is entirely unwound from spool |43, since the end of the ribbon is fastened to spool |43, spool |42 and gear |40 are held against further rotation endeavored to be produced by means of pinion |34. Pinion |34, therefore (Fig. 15) walks bodily around gear |40, so that the star wheels are rotatedcounterclockwise Idespite the force exerted by spring |31s operating through the lever |31 and roller |39. As is seen by comparison of Figs. 15 and 16, the 'star w els are rotated counterclockwise, since the spr g |31s is no longer fstrong enough to prevent rotation of the star wheels, and roller |39 thereupon rides up to the peak of a tooth |33a of the star wheel |36a, directly behind |3511, as shown in Fig. 16, and as the pinion |34 continues to walk around gear |40, the star wheels are rotated until roller |33 passes the peak or high point of a tooth |39a and due tothe generallyv toggle arrangement the star wheels are thereupon snapped counterclockwise to bring a different pinion |34 into engagement with gear |45, while the previously engaged pinion |34 is disconnected from the gear |40, as is seen in Fig. 17. As gear |33 is rotated step by step, counterclockwise, by elevation and depression of link I|2, pinion |34 in engagement with gear |45 rotates the gear |45 counterclockwise as viewed in Fig. 14 or clockwise as viewed in Fig. l, whereby the ribbon is now wound around spool |54 and unwound from spool |42.

' Similarly, as described. above, if .the ribbon should snarl or catch or should in any manner exert a. force so as to prevent rotation of the spool upon which the ribbon is being wound, an

automatic reversal of the ribbon feed will ensue.

Due to the two simultaneous rotations of the pinions |34, that is, clockwise rotation of these pinions about their studs and counterclockwise or bodily rotation thereof about shaft |25, there will be no Jamming of the gears during shifting of the gear frame when one of the pinions |34 is coming into mesh (Figs. 15 and 16) with the previously disengaged one of the two gears |40 and |45. Since there is always a positive connection between the driving means and atleast one of the ribbon spools during ribbon feed reversal, it is impossible for the gear frame to be halted at the dead center of the toggle arrangement while characters are being printed.

Novel ribbon reversal means are therefore provided which automatically and expeditiously produce ribbon reversal whenever such a reversal is necessary.

. General operation While the operations of the various elements of the complete mechanism have been given in connection with the respective individual descriptions, a brief description of the operation of all elements of the device will'now be presented in order to clarify the novel coaction of the relative parts in producing a unitary result, namely, printing of characters on a' tape in response to code signal permutations received, each permutation being representative of a character to be printed or a function to be performed.

Upon reception of the five signal elements comprising a code permutation, certain of the magnets 5|, 52, 53, 5 4 and 55 (Fig. 2) will be energized. Upon energization of any one of the magnets 5|, 52 or 53, the permutation rings 51, 58 and 59 (Fig. 5) will be relatively rotated to align certain of the notches 5111 5811I and 5311,. so that a chosen stop element 8| will be permitted to enter the particular permutation of signal elements controlling the magnets 5| 52 and 03.

Similarly, magnets 04 and 55 are energized selectively by the received code signal permutation and permutation rings 1| and 12 (Fig. 5) will be relatively rotatively positioned to permit entry of a stop element 6| into the newly aligned notches 1|n and 1211,. The associated clutch 09 will be thereupon rotated until the newly selected stop is engaged by dog lift lever 42 and shaft 28A will be rotatively positioned in accordance with the particular permutation of code signal elements controlling solenoids 04 and 50.

Rotation of shaft 23A oscillates the arm 15 (Fig. V2) to axially move the typewheel 50 to one of four axial positions to select one ring of characters.

Rotation of shaft 24A as described above will rotate the typewheel element to one rotative position so that the particular character from the selected ring of characters will be selectively positioned with respect to hammer |01 (Fig. 4). Upon energization of any signal receiving lmagnet. the magnet 56 (Figs. 4 and 5) which is in the return circuit of all the magnets to 05, inclusive, will be energized. The particular clutch 39 controlled by magnet 56 has only one rotative stop. position, so that shaft 25A is ro- .since'shafts 23A and 24A are rotated at 1200 R. P. M. while the shaft 25A is rotated only at 900 R.. P. M., regardless of which stop elements assaese is maintained in position by means of the spring i 109s. Also while lever |02 is being depressed, the

pawl |00 slips back one tooth on the ratchet wheel 99 and upon release of lever |02 by the continued rotation of cam 34, spring |04 will raise the lever |02 and pawl |00 will advance the ratchet wheel 99 to rotate the rollers Bia and 9|b, and rollers 90a and 90b to thereby advance the tape. As the shaft A continues to rotate, cam 34 engages the cam follower |091) to release the latch |09 and the hammer |01 will thereupon force the tape 08 and the ribbon ||3 against the chosen aligned character of typewheel 50 (Fig. l) to print the selected character.

'While shaft 25A is rotating, cam 35 will engage the lever ||0, to raise the link I2 (Fig. 14) to thereby rotate one ofthe spools |42 or |43 to wind up the ribbon on one spool 4and to unwind it from the other, as described above. When the ribbon is completely unwound, the ribbon feed reversal mechanism will automatically reverse the direction of winding as previously explained.

Novel printing, ribbon feed andv ribbon reversal mechanism cooperating with the selecting and are selected, the shafts 23A and 24A will be halted by the time shaft 25A has completed three quarters o f'a revolution.

If the code signal received -is representative of the shift function, the typewheel element 50 will lbemoved to the right of the position as illustrated in Fig. 4 until it assumes its extreme right l' hand position under control of the rotating shaft 23A, cam slot 3|a and oscillating lever 15 (Fig.

2). In the extreme right hand -position of typewheel 50, the shaft 24A will be rotatively positioned in either one of two positions separated by 180, dependent upon whether the gures shift function or the letters shift function is de- -sired. In this extreme right hand position of the typewheel 50, the radially slidable element 418 (Figs. 8 and 9) will project off-center down- -rotation of shaft 25A will irst rotate the cam 34 (Fig. l) to depress the lever |02 about its pivot |03 to in turn depress the hammer |01 against the force of spring |08 until the latch |09 engages notch |01n in hammer |01 and the latch shifting means, as above-are provided to produce printing ofa' character quicklyand in an emcient manner.

While there has been shown and described and pointed out the fundamental novel features of the invention as applied to a single modification it will be understoodthat various omissions and substitutions and changes in the form and details of the device illustrated and in its operation may be made by those skilled in'the art, without departing from the spirit of the invention. It is the intention, therefore, to be limited only as indicated by the scope of the following claims.

What is claimed is:

l. In a printing telegraph receiver, a typewheel,

a printing hammer, and means for operating said printing hammer including a rotatable shaft, a single cam element on said shaft rotatable therewithmeans resiliently urging said hammer toward said typewheel, means including a pivoted lever controlled by said cam element for moving said, hammer against the force of said urging means to cock said hammer, a pivoted latching member, and means on said hammer cooperating with the latching member to latch and retain the hammer in cocked position, said latching member also being controlled by the said cam element for moving Ythe latching member out of cooperation with the hammer, thereby effecting release of the cocked hammer.

2. In a printing telegraph receiver,Y a typewheel, and a printing mechanism comprising a slidable member having a slot therein, a pivoted lever passing through said slot, resilient means urging said member toward said typewheel, a pivoted latch, means on said slidable member cooperating with said latch upon motion of said member in one direction under the influence of said pivoted lever to latch said member in cocked position, and means for sequentially oscillating said lever and releasing said latch to uncock said slidable member, said resilient means thereupon urging said slidable member into printingrelation with said typewheel. Y l

CLYDE J. FITCH.- KURT RUDOLF SCHNEIDER. 

